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The occurrence of M74 syndrome in female sea trout, Salmo trutta m. trutta, belonging to two populations returning to spawn in Polish rivers in the fall of 2003 and three from pond cultivation were investigated. Eggs from a total of 250 female specimens were investigated from rivers in northern Poland (10 – Parsęta, 100 – Miastko, 140 – Świbno). The study method applied involved comparing the concentrations...
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